10 yards
The width and circumference is 10 yards
The center circle.
The circumference of the center circle of a soccer field is pi times its diameter (which is 10 yards). It could also be expressed as 2 times pi times its radius (which is 5 yards). It's about 31.416 yards.
The diameter of the center circle on a regular soccer field (100x60 yards) is 20 yards.
The line in the center of a soccer field is the center line.
During a kick off, the opposing team may not enter this circle until the ball is touched by the kicking team.
1 yard
So soccer has the circle in the middle of the field. That is related to pi because it is a circle. That is how they are related!
8x10 yds
The radius of the largest circle that fits in a 176-yd square is 88 yds.
I'm not sure what you are asking here, but at the centre of a soccer field is a centre or half way line and a circle with a 9.15m (10 yard) radius.For more details, check out - http://en.wikipedia.org/wiki/Image:Football_pitch_metric.svg
The lines that mark a soccer field are touch lines, goal lines, the halfway line, the center circle, corner arcs, goal area lines, penalty area lines, and penalty arcs.
That is the penalty arc. Its center is the penalty mark and has a radius of 10 yards. During a penalty kick, all non-kicking players must be outside of the penalty area and also the penalty arc at the moment of the kick.